test_ruckig_traj_smoothing.cpp

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/* Author: Andy Zelenak */
 
#include <gtest/gtest.h>
#include <moveit/trajectory_processing/ruckig_traj_smoothing.h>
#include <moveit/robot_state/robot_state.h>
#include <moveit/utils/robot_model_test_utils.h>
 
namespace
{
constexpr double DEFAULT_TIMESTEP = 0.1;  // sec
constexpr char JOINT_GROUP[] = "panda_arm";
 
class RuckigTests : public testing::Test
{
protected:
  void SetUp() override
  {
    robot_model_ = moveit::core::loadTestingRobotModel("panda");
    trajectory_ = std::make_shared<robot_trajectory::RobotTrajectory>(robot_model_, JOINT_GROUP);
  }
 
  moveit::core::RobotModelPtr robot_model_;
  robot_trajectory::RobotTrajectoryPtr trajectory_;
  trajectory_processing::RuckigSmoothing smoother_;
};
 
}  // namespace
 
TEST_F(RuckigTests, basic_trajectory)
{
  moveit::core::RobotState robot_state(robot_model_);
  robot_state.setToDefaultValues();
  robot_state.zeroVelocities();
  robot_state.zeroAccelerations();
  // First waypoint is default joint positions
  trajectory_->addSuffixWayPoint(robot_state, DEFAULT_TIMESTEP);
 
  // Second waypoint has slightly-different joint positions
  std::vector<double> joint_positions;
  robot_state.copyJointGroupPositions(JOINT_GROUP, joint_positions);
  joint_positions.at(0) += 0.05;
  robot_state.setJointGroupPositions(JOINT_GROUP, joint_positions);
  trajectory_->addSuffixWayPoint(robot_state, DEFAULT_TIMESTEP);
 
  EXPECT_TRUE(
      smoother_.applySmoothing(*trajectory_, 1.0 /* max vel scaling factor */, 1.0 /* max accel scaling factor */));
}
 
TEST_F(RuckigTests, basic_trajectory_with_custom_limits)
{
  // Check the version of computeTimeStamps that takes custom velocity/acceleration limits
 
  moveit::core::RobotState robot_state(robot_model_);
  robot_state.setToDefaultValues();
  robot_state.zeroVelocities();
  robot_state.zeroAccelerations();
  // First waypoint is default joint positions
  trajectory_->addSuffixWayPoint(robot_state, DEFAULT_TIMESTEP);
 
  // Second waypoint has slightly-different joint positions
  std::vector<double> joint_positions;
  robot_state.copyJointGroupPositions(JOINT_GROUP, joint_positions);
  joint_positions.at(0) += 0.05;
  robot_state.setJointGroupPositions(JOINT_GROUP, joint_positions);
  trajectory_->addSuffixWayPoint(robot_state, DEFAULT_TIMESTEP);
 
  // Custom velocity & acceleration limits for some joints
  std::unordered_map<std::string, double> vel_limits{ { "panda_joint1", 1.3 } };
  std::unordered_map<std::string, double> accel_limits{ { "panda_joint2", 2.3 }, { "panda_joint3", 3.3 } };
  std::unordered_map<std::string, double> jerk_limits{ { "panda_joint5", 100.0 } };
 
  EXPECT_TRUE(smoother_.applySmoothing(*trajectory_, vel_limits, accel_limits, jerk_limits));
}
 
TEST_F(RuckigTests, trajectory_duration)
{
  // Compare against the OJET online trajectory generator: https://www.trajectorygenerator.com/ojet-online/
  // Limits can be verified like this. Note that Ruckig applies defaults if the RobotModel has none.
  // robot_model_->printModelInfo(std::cerr);
  const double ideal_duration = 0.210;
 
  moveit::core::RobotState robot_state(robot_model_);
  robot_state.setToDefaultValues();
  robot_state.zeroVelocities();
  robot_state.zeroAccelerations();
  // Special attention to Joint 0. It is the only joint to move in this test.
  // Zero velocities and accelerations at the endpoints
  robot_state.setVariablePosition("panda_joint1", 0.0);
  trajectory_->addSuffixWayPoint(robot_state, 0.0);
 
  robot_state.setVariablePosition("panda_joint1", 0.1);
  trajectory_->addSuffixWayPoint(robot_state, DEFAULT_TIMESTEP);
 
  EXPECT_TRUE(
      smoother_.applySmoothing(*trajectory_, 1.0 /* max vel scaling factor */, 1.0 /* max accel scaling factor */));
 
  // No waypoint durations of zero except the first
  for (size_t waypoint_idx = 1; waypoint_idx < trajectory_->getWayPointCount() - 1; ++waypoint_idx)
  {
    EXPECT_NE(trajectory_->getWayPointDurationFromPrevious(waypoint_idx), 0);
  }
 
  // The trajectory duration should be within 10% of the analytical solution since the implementation here extends
  // the duration by 10% at every iteration.
  EXPECT_GT(trajectory_->getWayPointDurationFromStart(trajectory_->getWayPointCount() - 1), 0.9999 * ideal_duration);
  EXPECT_LT(trajectory_->getWayPointDurationFromStart(trajectory_->getWayPointCount() - 1), 1.11 * ideal_duration);
}
 
TEST_F(RuckigTests, single_waypoint)
{
  // With only one waypoint, Ruckig cannot smooth the trajectory.
  // It should simply pass the trajectory through unmodified and return true.
 
  moveit::core::RobotState robot_state(robot_model_);
  robot_state.setToDefaultValues();
  robot_state.zeroVelocities();
  robot_state.zeroAccelerations();
  // First waypoint is default joint positions
  trajectory_->addSuffixWayPoint(robot_state, DEFAULT_TIMESTEP);
 
  // Trajectory should not change
  auto first_waypoint_input = robot_state;
 
  // Only one waypoint is acceptable. True is returned.
  EXPECT_TRUE(
      smoother_.applySmoothing(*trajectory_, 1.0 /* max vel scaling factor */, 1.0 /* max accel scaling factor */));
  // And the waypoint did not change
  const auto new_first_waypoint = trajectory_->getFirstWayPointPtr();
  const auto& variable_names = new_first_waypoint->getVariableNames();
  for (const std::string& variable_name : variable_names)
  {
    EXPECT_EQ(first_waypoint_input.getVariablePosition(variable_name),
              new_first_waypoint->getVariablePosition(variable_name));
  }
}
 
int main(int argc, char** argv)
{
  testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
}